低温胁迫对天女木兰某些生理指标的影响

Effect of Low Temperature Stress on Physiological Process of Magnolia sieboldii

对天女木兰幼苗进行低温胁迫处理,从膜脂过氧化作用、可溶性糖含量与保护酶几个方面探讨了天女木兰的抗寒生理机制。结果表明:在低温胁迫过程中,10℃处理的MDA含量先显著增加,后开始回落,15℃处理的MDA含量变化趋势与10℃处理的大致相同,而对照植株的MDA含量表现出一定的稳定性。可溶性糖的积累随温度的降低而增加,随着胁迫时间的持续,其含量先增加而后有所回落。低温胁迫后,POD活性呈现出降低—升高—降低的变化趋势,10℃低温处理POD活性降低的幅度比15℃处理大。SOD活性表现出先升高而后降低的趋势,10℃低温处理SOD活性升高的幅度大于15℃处理。

The studies on membrane-lipid peroxidation, soluble sugar content, changes of defensive enzyme activity of Magnolia sieboldii K. Koch were carried out , and the main purpose was to disclose the physiological acclimation mechanisms. The results were as follows： During low temperature stress, the MDA content of the treatment at 10℃ increased first, then fell after a rise, and the MDA content of the treatment at 15℃ had similar change trend with that of the treatment at 10 ℃. While the temperature decreased, soluble sugar content increased. During low temperature stress, its content increased first, then fell after a rise. POD activity displayed a change trend of falling-rising-falling, while SOD activity increased first, then fell after a rise.